Megan Fox has compared fans' wild response to Robert Pattinson when he is on the red carpet to The Beatles and The Backstreet Boys.

The actress spoke about the Twilight star at the premiere of her new film Transformers - Revenge Of The Fallen.

When asked if the crowds at the red carpet event were the craziest she had experienced, Fox told take40: "No I think as crazy as it gets is when Robert Pattinson goes anywhere, that's as crazy as it gets.

“He's a Beatle, he's all the Beatles, he's the Backstreet Boys band in a person."

The Transformers star has been romantically linked to Pattinson on and off since March after the pair were spotted at an LA nightclub together.

But Fox dismissed any reports of a relationship on the red carpet.

"No I know him and he laughs about it, it was a joke,” she said.

Robert Pattinson gets mobbed by fans